Electrical controller.



F. L. SESSIONS.

ELECTRICAL CONTROLLER.

APPLICATION FILED 11:12.5, 1909.

949,333. Patented Feb. 15, 1910.

ami/knew $1; 1X. yav (0650/ UNITED STATES PATENT OFFICE.

FRANK L. SESSIONS, OF COLUMBUS, OHIO, ASSIGNOR TO THE JEFFREY MANUEAC-TUBING COMPANY, A CORPORATION OF OHIO.

ELECTRICAL CONTROLLER.

Patented Feb. 15, 1910.

Original application filed December 12, 1907, Serial No. 406,206.Divided and this application filecl February 5, 1908.

To all whom it may concern:

Be it known that I, FRANK L. SESSIONS, a citizen of the United States,residing at C0- lumbus, in the county of Franklin and State of Ohio,have invented certain new and useful Improvements in ElectricalCont-rollers, of which the following is a specification, reference beinghad therein to the accompanying drawing.

This invention relates to improvements in electrical controllers such asare used for starting and controlling electric motors, and is especiallyadapted for use in mines.

In some mines explosive gases are met with and serious explosions resultif there be any exposed flame or sparks in the region where gasescollect. As is well known, electrical controllers, such as are commonlyused, frequently cause sparks and flames of such nature that explosivegases of the kind met with in mines will be fired.

The object of this invention is to provide an electrical controller soconstructed that there shall be no danger of explosive gases beingfired.

In the drawings Figure l is a vertical longitudinal section of thecontroller. Fig. 2 is a face view of the controller with the cover andoperating lever removed.

The main frame or casing of the controller is indicated by A. This frameor casing preferably has integral top, bottom and side walls.

1 indicates the front closing plate or cover, and 1 indicates the rearclosing plate or cover. iVhen the controller is mounted upon a motor therear cover 1 may be omitted, its place being supplied by the motor frameagainst which the cont-roller is secured.

The interior of the box is divided by partition 2 into chambers 8 and41-, said partition extending from the bottom part way to the top. Therear or inner part of the box is preferably oval in outline, asindicated by the dotted lines of Fig. 2, while the other part isrectangular, there being corner wall sections at 5, where therectangular and oval parts come together.

6 indicates an insulating plate or slab of slate, marble or the likewhich is secured to the corner sections 5 of the casting. To this plateare secured the contacts 7 with which are connected ends of theresistance coils 8,

Serial No. 476,253.

which are placed in the chamber 3. The clamps 9 and 10 for the circuitterminals are also mounted on the plate 6.

11 is the contact lever pivoted to the plate 12 which is electricallyconnected, preferably by wire 13, with the clamp 9.

The cover 1 is provided at a point in line with the axis of lever 11with an aperture a, bounded by bosses having finished faces at 14 and 1415 is a stud shaftmounted in this aperture and formed at its inner endwith a flange finished to lit the face 143, and extended to form a leverarm 16 with rearwardly projecting lugs 16 which are adapted to embracethe lever 11. To the outer reduced end of stud shaft- 15, a hand lever17 is secured, said lever being provided at its pivotal end with afinished face to fit the finished face 14 of the cover.

It will be seen that the movement of the hand lever is directlytransmitted to the contact lever 11 and that the latter may be moved tostart and control the motor in the usual manner. It is also clear thatthe construction described provides a flame-proof inclosure for theelectrical parts within and prevents any sparks or flames that may beproduced when the contact lever moves from one point to another fromigniting any gas or dust outside of the box.

This application constitutes a division of my application filed December12, 1907, Serial No. 406,206.

hat I claim is 1. In an electrical controller, a flameproof casing, aremovable cover therefor, resistance coils, contact points connectedthere to, a contact arm pivotally mounted within the casing and adaptedto engage the contact points, and operating means for the contact armmounted upon said removable cover, substantially as set forth.

2. In an electrical controller, a flameproof casing, resistance coilsand contact points therein, a contact arm pivotally mounted and adaptedto engage the contact points, an operating lever pivotally mountedindependently of the contact arm, and means whereby the operating levermay engage the contact arm, substantially as set forth.

3. In an electrical controller, a flameproof casing having an aperture,an operating lever having a spindle which passes through the aperturewith a flame-proof fit,

resistance coils and contact points within the casing, a contact armadapted to engage nation of a flame-proof casing, resistance coils andcontact points therein, a contact arm pivotally mounted and adapted toengage the contact points, an operating lever I pivotally mounted in awall of the casing, its pivotal axis being in a line with the pivotalaxis of the contact arm, and means whereby the operating lever mayengage the contact arm, substantlally as set forth.

6. In an electrical controller, a casing having one portion rectangularand another portion approximately elliptical, and an insulating platemounted on the shoulders formed between the two sections, substantiallyas set forth.

In testimony whereof I affix my signature,

in presence of two witnesses.

FRANK L. SESSIONS.

WVitnesses:

G. B. NORRIS, DUDLEY T. FISHER.

